Upper Cup Muffler Fixing Structure for Hermetic Compressor Sealing
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Solution Overview
Problem
Existing methods for fixing an upper cup muffler to an upper bearing portion in hermetically sealed compressors are not adaptable to shape changes in the bearing portion, requiring a new muffler for each compressor type, leading to inefficiencies and potential refrigerant leaks.
Innovation Solution
A fixing structure and method where the upper cup muffler's peripheral side surface lower portion forms a slant contact with the bearing portion's step surface, using a bolt to secure the muffler, ensuring linear or planar contact and sealing, even with shape changes in the bearing portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the upper cup muffler is pressed and engagedly fitted into the upper bearing portion using the conventional method, then the sealing function is achieved, but the adaptability to shape changes in the upper bearing portion is poor
Solution Approach 1:
The peripheral side surface of the upper cup muffler is divided into multiple sections: an upper portion that contacts the outer peripheral surface of the upper bearing portion, and a lower portion that contacts the lower surface of the step portion. This segmentation allows each section to independently adapt to shape variations while maintaining sealing integrity.
Solution Approach 2:
The contact interface is extended from a single surface to multiple surfaces by utilizing both the outer peripheral surface and the lower surface of the step portion. This multi-dimensional contact approach provides redundancy and adaptability to shape changes in the upper bearing portion.
2Reliability
If a new upper cup muffler is developed for each change in upper bearing portion shape, then the sealing function is maintained, but the development time and cost increase
Solution Approach 1:
The upper cup muffler design with its multi-section peripheral side surface structure serves as a universal component that can adapt to various shapes of upper bearing portions. This universal design eliminates the need to develop new mufflers for each compressor type variation.
Solution Approach 2:
The design allows the upper cup muffler to accommodate changes in geometric parameters of the upper bearing portion through its flexible contact surface configuration, maintaining sealing performance across different parameter variations without requiring redesign.
3Ease of manufacture
If the upper cup muffler is pressed and engagedly fitted into the upper bearing portion, then the assembly is simple, but the contact area is insufficient leading to potential refrigerant leaks
Solution Approach 1:
The sealing contact is segmented into multiple locations: contact between the upper portion of the peripheral side surface and the outer peripheral surface, and contact between the lower portion of the peripheral side surface and the lower surface of the step portion. This segmentation increases the total contact area while maintaining assembly simplicity.
Data Source
AI summary
A structure and method for fixing an upper cup muffler to an upper bearing portion. The upper bearing portion includes a step portion having an upper, lower and side surfaces. A peripheral edge portion between the upper and side surfaces of the upper bearing portion is declined outwardly to have a slant surface. The upper cup muffler includes a bottom surface and a peripheral side surface lower portion that extends downwardly from the edge portion of the bottom surface. The peripheral side surface lower portion gets across the slant surface of the upper bearing portion and is brought into linear or planar contact with at least one of the outer side surface and the lower surface of the step portion when the bottom surface of the upper cup muffler and the upper surface of the upper bearing portion are fixed to each other.